POLICE are trying to trace a witness who went to the aid of a cyclist who was battered and left for dead in Ewell.

Filipe Nunes David was assaulted in Cox Lane on August 18, suffering injuries which have now been described as life-changing.

After his attackers had fled the scene, police said a woman who was driving a black car spotted Mr David and stopped to help. She gave the victim a blanket and waited with him until paramedics arrived.

She was described as around 50-years-old, with a dark bob-style haircut, wearing a long floral skirt and a black top.

Detective Inspector Jeff Brooks said: “We are continuing to piece together all the events of that night and we need to speak to everyone who was in Cox Lane around the time of the attack.

“In particular we would like to speak to the driver of this car who saw Mr David in distress shortly afterwards.

"There is no need for you to be concerned but we do need to speak to you so we can build up a complete picture of events.

“If you were the driver or you know who they are please get in touch with police as soon as possible.”

Mr David was taken to hospital in a critical condition and put on life support. His condition has since stabilised but his injuries are described as “extremely serious and life-changing".

Brett Carslake, 20, and two 16-year-old boys, all from Ewell, have been charged with GBH with intent and will appear in court in November.

An 18-year-old and a 16-year-old were released on police bail pending further inquires.